Which Republican incumbents seem vulnerable to you next year? And why? Lots of people in DC get paid tons of money to answer this question. And generally they know what they're talking about. But some shifts in the wind are hard to sense at a distance, even with access to the best polling and census data. So let us know what you're seeing where you live. We've set up a discussion thread here. Tell us who you think is vulnerable and just as importantly, why.